//package from net for headimg upload
window.onload = function() {


    jQuery.extend({

        //8-18 deal with error:jQuery.handleError is not a function
        handleError: function( s, xhr, status, e ){
            // If a local callback was specified, fire it
            if ( s.error ) {
                s.error.call( s.context || s, xhr, status, e );
            }

            // Fire the global callback
            if ( s.global ) {
                (s.context ? jQuery(s.context) : jQuery.event).trigger( "ajaxError", [xhr, s, e] );
            }
        },



        createUploadIframe: function (id, uri) {
            //create frame
            var frameId = 'jUploadFrame' + id;

            if (window.ActiveXObject) {
                var io = document.createElement('<iframe id="' + frameId + '" name="' + frameId + '" />');
                if (typeof uri == 'boolean') {
                    io.src = 'javascript:false';
                }
                else if (typeof uri == 'string') {
                    io.src = uri;
                }
            }
            else {
                var io = document.createElement('iframe');
                io.id = frameId;
                io.name = frameId;
            }
            io.style.position = 'absolute';
            io.style.top = '-1000px';
            io.style.left = '-1000px';

            document.body.appendChild(io);

            return io
        },
        createUploadForm: function (id, fileElementId) {
            //create form
            var formId = 'jUploadForm' + id;
            var fileId = 'jUploadFile' + id;
            var form = $('<form  action="" method="POST" name="' + formId + '" id="' + formId + '" enctype="multipart/form-data"></form>');
            var oldElement = $('#' + fileElementId);
            var newElement = $(oldElement).clone();
            $(oldElement).attr('id', fileId);
            $(oldElement).before(newElement);
            $(oldElement).appendTo(form);
            //set attributes
            $(form).css('position', 'absolute');
            $(form).css('top', '-1200px');
            $(form).css('left', '-1200px');
            $(form).appendTo('body');
            return form;
        },
        addOtherRequestsToForm: function (form, data) {
            // add extra parameter
            var originalElement = $('<input type="hidden" name="" value="">');
            for (var key in data) {
                name = key;
                value = data[key];
                var cloneElement = originalElement.clone();
                cloneElement.attr({'name': name, 'value': value});
                $(cloneElement).appendTo(form);
            }
            return form;
        },

        ajaxFileUpload: function (s) {
            // TODO introduce global settings, allowing the client to modify them for all requests, not only timeout
            s = jQuery.extend({}, jQuery.ajaxSettings, s);
            var id = new Date().getTime()
            var form = jQuery.createUploadForm(id, s.fileElementId);
            if (s.data) form = jQuery.addOtherRequestsToForm(form, s.data);
            var io = jQuery.createUploadIframe(id, s.secureuri);
            var frameId = 'jUploadFrame' + id;
            var formId = 'jUploadForm' + id;
            // Watch for a new set of requests
            if (s.global && !jQuery.active++) {
                jQuery.event.trigger("ajaxStart");
            }
            var requestDone = false;
            // Create the request object
            var xml = {}
            if (s.global)
                jQuery.event.trigger("ajaxSend", [xml, s]);
            // Wait for a response to come back
            var uploadCallback = function (isTimeout) {
                var io = document.getElementById(frameId);
                try {
                    if (io.contentWindow) {
                        xml.responseText = io.contentWindow.document.body ? io.contentWindow.document.body.innerHTML : null;
                        xml.responseXML = io.contentWindow.document.XMLDocument ? io.contentWindow.document.XMLDocument : io.contentWindow.document;

                    } else if (io.contentDocument) {
                        xml.responseText = io.contentDocument.document.body ? io.contentDocument.document.body.innerHTML : null;
                        xml.responseXML = io.contentDocument.document.XMLDocument ? io.contentDocument.document.XMLDocument : io.contentDocument.document;
                    }
                } catch (e) {
                    jQuery.handleError(s, xml, null, e);
                }
                if (xml || isTimeout == "timeout") {
                    requestDone = true;
                    var status;
                    try {
                        status = isTimeout != "timeout" ? "success" : "error";
                        // Make sure that the request was successful or notmodified
                        if (status != "error") {
                            // process the data (runs the xml through httpData regardless of callback)
                            var data = jQuery.uploadHttpData(xml, s.dataType);
                            // If a local callback was specified, fire it and pass it the data
                            if (s.success)
                                s.success(data, status);

                            // Fire the global callback
                            if (s.global)
                                jQuery.event.trigger("ajaxSuccess", [xml, s]);
                        } else
                            jQuery.handleError(s, xml, status);
                    } catch (e) {
                        status = "error";
                        jQuery.handleError(s, xml, status, e);
                    }

                    // The request was completed
                    if (s.global)
                        jQuery.event.trigger("ajaxComplete", [xml, s]);

                    // Handle the global AJAX counter
                    if (s.global && !--jQuery.active)
                        jQuery.event.trigger("ajaxStop");

                    // Process result
                    if (s.complete)
                        s.complete(xml, status);

                    jQuery(io).unbind()

                    setTimeout(function () {
                        try {
                            $(io).remove();
                            $(form).remove();

                        } catch (e) {
                            jQuery.handleError(s, xml, null, e);
                        }

                    }, 100)

                    xml = null

                }
            }
            // Timeout checker
            if (s.timeout > 0) {
                setTimeout(function () {
                    // Check to see if the request is still happening
                    if (!requestDone) uploadCallback("timeout");
                }, s.timeout);
            }
            try {
                // var io = $('#' + frameId);
                var form = $('#' + formId);
                $(form).attr('action', s.url);
                $(form).attr('method', 'POST');
                $(form).attr('target', frameId);
                if (form.encoding) {
                    form.encoding = 'multipart/form-data';
                }
                else {
                    form.enctype = 'multipart/form-data';
                }
                $(form).submit();

            } catch (e) {
                jQuery.handleError(s, xml, null, e);
            }
            if (window.attachEvent) {
                document.getElementById(frameId).attachEvent('onload', uploadCallback);
            }
            else {
                document.getElementById(frameId).addEventListener('load', uploadCallback, false);
            }
            return {
                abort: function () {
                }
            };

        },

        uploadHttpData: function (r, type) {
            var data = !type;
            data = type == "xml" || data ? r.responseXML : r.responseText;
            // If the type is "script", eval it in global context
            if (type == "script")
                jQuery.globalEval(data);
            // Get the JavaScript object, if JSON is used.
            if (type == "json") {
                // If you add mimetype in your response,
                // you have to delete the '<pre></pre>' tag.
                // The pre tag in Chrome has attribute, so have to use regex to remove
                var data = r.responseText;
                var rx = new RegExp("<pre.*?>(.*?)</pre>", "i");
                var am = rx.exec(data);
                //this is the desired data extracted
                var data = (am) ? am[1] : "";    //the only submatch or empty
                eval("data = " + data);
            }
            // evaluate scripts within html
            if (type == "html")
                jQuery("<div>").html(data).evalScripts();
            //alert($('param', data).each(function(){alert($(this).attr('value'));}));
            return data;
        }
    });

}